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Fruit tree fertilization should pay attention to the problem
Do not use ammonium nitrate. Nitrate nitrogen is easily absorbed by fruit trees during their growth phase. However, after applying ammonium nitrate, the nitrate ions taken up by the trees can be rapidly consumed, potentially leading to an accumulation of toxic substances in the plant.
Second, avoid applying ammonium bicarbonate in dry conditions. Ammonium bicarbonate is highly unstable and tends to volatilize quickly. When used as a base fertilizer or top dressing, it should be applied when the orchard soil is moist, and the soil should be covered immediately after application. If the soil is very dry, it’s better to water the area first before applying ammonium bicarbonate.
Third, avoid repeated use of ammonium sulfate. In orchards with acidic to slightly alkaline soils, continuous use of ammonium sulfate can increase soil acidity, leading to compaction and reduced root activity. This can result in poor tree growth, lower yields, and a decline in fruit quality.
Fourth, do not apply urea immediately after watering. Urea contains nitrogen that must be converted into ammonium carbonate by soil microorganisms before it can be absorbed by the roots. If you water right after applying urea, the nitrogen may be lost. Therefore, whether using urea as a base fertilizer or a top dressing, it's best to wait 3 to 5 days after watering before application to prevent nutrient loss.
From *Modern Fertilization Collection* by Zuo Guangsheng